int main (int argc, char **argv)
{
	int i,nch,lch;
	
	if (argc < 2)
		return 1;

	for (i=0;i<strlen(argv[1]);i++)
	{
		lch=tolower(argv[1][i]);
		if ((97<=lch)&&(122>=lch))
		{
			nch=lch-13;
			if (nch<97)
				nch=nch+26;
		}
		else
			nch=lch;
		printf("%c", nch);
	}
	printf("\n");
	return 0;
}